package com.skillworld.webapp.web.pages.rest.school;

import org.apache.tapestry5.annotations.ContentType;
import org.apache.tapestry5.annotations.Property;
import org.apache.tapestry5.annotations.SessionState;
import org.apache.tapestry5.ioc.annotations.Inject;
import org.apache.tapestry5.services.Request;

import com.skillworld.webapp.model.courseservice.CourseService;
import com.skillworld.webapp.model.util.PermissionDeniedException;
import com.skillworld.webapp.web.util.ErrorMessages;
import com.skillworld.webapp.web.util.UserSession;

import es.udc.pojo.modelutil.exceptions.InstanceNotFoundException;

@ContentType("text/xml")
public class AnswerExam {
	
	@SuppressWarnings("unused")
    @Property
    private String errorMessage = null;
    
    @Inject
    private CourseService courseService;
	
    @SessionState(create=false)
    private UserSession userSession;
   
    private boolean userSessionExists;
   
    @Inject
    private Request request;

    
    void onPassivate()
    { 
        return; 
    }
    
    void onActivate()
    {        
        if (!userSessionExists)
        {
            errorMessage = ErrorMessages.NOT_LOGGED_IN;
            return;
        }

        String lessonParam = request.getParameter("lesson");
        String fileURL = request.getParameter("file");
        if (lessonParam == null || fileURL == null)
        { 
            errorMessage = ErrorMessages.INVALID_ARGUMENTS;
            return;
        }
        
    	try
    	{
    	    long lessonId = Long.parseLong(lessonParam);
    	    courseService.answerExam(userSession.getUserId(), lessonId, 
    	                                fileURL);
		}
        catch(NumberFormatException e)
        { errorMessage = ErrorMessages.INVALID_ARGUMENTS; }
    	catch (InstanceNotFoundException e)
    	{ errorMessage = ErrorMessages.INSTANCE_NOT_FOUND; } 
    	catch (PermissionDeniedException e)
    	{ errorMessage = ErrorMessages.PERMISSION_DENIED; }
    }
}
    

